Disable or enable a high availability manager

 

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A unique HAManagerService configuration object exists for every core group member. The enable attribute in this configuration object determines if the high availability manager is enabled or disabled for the corresponding process. When the enable attribute is set to true, the high availability manager is enabled. When the enable attribute is set to false, the high availability manager is disabled. By default, the high availability manager is enabled. If the setting for the enable attribute is changed, the corresponding process must be restarted before the change goes into effect. You must use the wsadmin tool to disable or enable a high availability manager.

• Determine if use a high availability manager to manage members of a core group.

• Add a script file that is similar to the following file to your system. This sample script file disables the high availability manager on a specific process. You can modify this script file if disable the high availability manager on all of the processes in a cell or on all of the processes that are members of a specific core group. You can also modify this script file to enable a high availability manager that you previously disabled.

  ##################################################################### 
  # Script name = disableHamOnProcess.pty 
  ##################################################################### 
   def getHAMServiceOnAll():     
      # get a list of all HAManagerService objects in the cell.     
      processes = AdminConfig.list("HAManagerService").split("\n")     
      rc = []     
      for p in processes:         
          p = p.strip()        
          rc.append(p)
      return rc
  
  # The HAManagerService ObjectName has the following format
  #cells/cellname/nodes/nodename/servers/servname:hamanagerservice.xml
   def getNodeName(service):
      # The 4th /-separated element in the service name is the node name
      n = service.split("/")[3]
      return n
   def getProcessName(service):
      # The 6th /-separated element in the service name is the process name
      p = service.split("/")[5]
      return p.split("|")[0]
   def printHelp():
      print "This script disables the HA Manager on a specific process"
      print "Format is disableHamOnProcess nodeName processName"
  
  ##################################
  # main
  ################################# if(len(sys.argv) > 1):
      # get node name and process name from the command line
      nodeName = sys.argv[0]
      processName = sys.argv[1]
      # get a list of all HAManagerService objects in the cell.
      processes = getHAMServiceOnAll()
      for p in processes:
          # debug
          print "Checking process "+p
          # Check for a node name match.
          n = getNodeName(p)
          if (nodeName == n):
              # node name matches, check for server name match
              pn = getProcessName(p)
              if (pn == processName):
                  # both node and process names match. Found the one we
                  # are looking for. Disable and exit.
                  print "Disabling the HA Manager on process ",
                  print p
                  AdminConfig.modify(p, [["enable", "false"]])
                  AdminConfig.save()
                  break else:
      printHelp()
  
  

 

Overview

You might want to disable a high availability manager if you are trying to reduce the amount of resources, such as CPU and memory, that WebSphere Application Server uses and have determined that the high availability manager is not required on some or all of the processes in a core group.

You might need to enable a high availability manager that you previously disabled because you are installing applications on core group members that must be highly available.

You must use the wsadmin tool to disable a high availability manager or to enable a high availability manager that you previously disabled.

 

Procedure

1. Start the wsadmin tool.

2. Start the deployment manager for the cell that contains the high availability manager that you are disabling or enabling. The deployment manager for this cell must be running for the sample script to work.

3. Use the wsadmin tool to issue the following command to start the script:

   -lang jython -f script_file_name node process_name 
   

   For example, to start the sample script for the WASDOCLNodePH02 node and the ClusterMember2 process,...

   -lang jython -f disableHamOnProcess.pty WASDOCLNodePH02 ClusterMember2 
   

4. Synchronize this change across all of the affected nodes.

5. Restart all of the processes for which the setting of the enable attribute in the HAManagerService configuration object is changed.

 

Results

The processes start with the high availability manager in the changed state.

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Related tasks

Start the wsadmin scripting client
Setting up a high availability environment

 

Related Reference

When to use a high availability manager